Abstract: A bag making apparatus includes a welding device for welding a sheet panel and a strip member in a zone where the sheet panel is intermittently fed by a feed device and a cut device disposed downstream of the welding device to cross-cut the sheet panel and the strip member every intermitted feed cycle. The welding device include a pressure unit for pressurizing the sheet panel and the strip member superposed on each other and a laser unit for irradiating the sheet panel or the strip member with a laser beam at an irradiation position upstream of a pressure position of the pressure unit to melt the sheet panel or the strip member. The pressure unit and the laser unit are configured to be movable together upstream and downstream relative to the sheet panel while maintaining a relative positional relationship between the pressure position and the irradiation position.

Abstract: At least one of a horn or an anvil includes protrusions that protrude from a facing surface thereof. Two panel parts and a gusset part folded and interposed between the panel parts are sandwiched and compressed by the horn and the anvil. Two portions of the gusset part are welded to each other by ultrasonic vibration of the horn during the sandwiching and compressing.

Abstract: A welding device includes a pair of pressure rollers for pressurizing a web and a strip member, a feed device configured to intermittently or continuously feed the web and the strip member through the pair of pressure rollers, and the laser device configured to irradiate the web or the strip member with a laser beam at a position upstream of the pair of pressure rollers. The welding device may include a movement device configured to move the pair of pressure rollers upstream with respect to the web and the strip member during pause or stop of feed. Alternatively, the feed device may pause or stop the web and the strip member after retracting the web and the strip member by a certain length.

Abstract: A bag making apparatus and a bag making method make bags. The bag has a first panel part and a first flap part formed by folding a first sheet part, and a second panel part and a second flap part formed by folding a second sheet part. The first and second panel parts face each other. The first and second flap parts are interposed between the first and second panel parts and face each other. An open edge is formed by folded edges of the first and second sheet parts. The bag further comprises adhesive located between the open edge and the engagement tool, interposed between the first and second flap parts and extending across the widths of the first and second sheet parts to peelably adhere the first and second flap parts to each other. Alternatively, the second sheet part may only consists of the second panel part.

Abstract: A heat seal device for use in a bag making apparatus includes: a first heat seal member; a second heat seal member facing the first heat seal member; a heater for heating at least one of the first heat seal member or the second heat seal member; a drive mechanism configured to move the first heat seal member towards and away from the second heat seal member so as to releasably sandwich a web between the first and second heat seal members; a sensor disposed to detect acceleration of the first heat seal member; and a measurement part configured to measure a sandwiching time during which the web is sandwiched by the first and second heat seal members based on data from the sensor.

Abstract: A punching machine includes a punch blade and a support for supporting a spout. The punching machine further includes a drive mechanism. When the punch blade and the spout supported by the support face each other in a direction perpendicular to a web with the web interposed between the punch blade and the spout, the drive mechanism moves one of the punch blade or the support towards the other in the vertical direction to punch a hole in the web using the punch blade and the spout.

Abstract: A welding device includes a pair of pressure rollers for pressurizing a web and a strip member, a feed device configured to intermittently or continuously feed the web and the strip member through the pair of pressure rollers, and the laser device configured to irradiate the web or the strip member with a laser beam at a position upstream of the pair of pressure rollers. The welding device may include a movement device configured to move the pair of pressure rollers upstream with respect to the web and the strip member during pause or stop of feed. Alternatively, the feed device may pause or stop the web and the strip member after retracting the web and the strip member by a certain length.

Abstract: In a plastic bag including a triangular flap which has a folded hypotenuse and an open hypotenuse, a flow path is formed by the folded hypotenuse or the open hypotenuse to discharge air or gas through the flow path.

Abstract: According to an apparatus for successively making the plastic bags, wherein the wastes 14 are formed in at least two areas adjacent to each other widthwise of the plastic film 1, and the apparatus can determine whether all of wastes 14 of each of the areas are discharged. The apparatus comprises at least one partition plate 20 in a suction path 16. The suction path 16 is divided into at least two widthwise of the plastic film 1. The wastes 14 is guided to each of the divided paths 21A, 21B, 21C, 21D and is discharged. The wastes 14 is detected by an optical sensor when the wastes 14 is discharged to each of the divided paths.

Abstract: A plastic bag has a safety even when a flap is not adhered on an outer surface of a side gusset. One of the opposite end portions of the side gusset is obliquely folded in half along a fold line and interposed between the two layers of the side gusset, so that the flap is formed by the end portion between the two layers of the side gusset. The flap includes a folded edge formed by a folded inner edge of the side gusset, and an open edge formed by one of the opposite end edges of the side gusset. The flap further includes a joining edge extending straight or curved and joining the folded edge and the open edge on opposite sides of the fold line.

Abstract: Punched and incised portions can be formed properly, in which it is not necessary to replace an anvil depending on a type of a sheet material. A punching unit 51 comprises: a punching blade 50 for punching a first panel material 11, a second panel material 12, an open tape and a mounting base portion so as to form a punching portion; a incising portion 51 for incising the second panel material 12 and the mounting base portion disposed on the open tape so as to form a incising portion; and an adjusting portion 54 for adjusting a first gap 56 in a punching direction 5Z between edges 50A and 51A of the punching and incising blades 50 and 51.

Abstract: A web of first or second material is provided with the spout, and a plastic bag is made from side gusset materials in addition to webs of the first and second materials. An aperture is formed in the web of the first or second panel material, and the spout is inserted into and positioned with the aperture, whenever the webs of the first and second panel materials are fed intermittently. After the webs of the first and second panel materials are superposed on each other, whenever the webs of the first and second panel materials are fed intermittently, the webs of the first and second panel materials are heat sealed with each other in a longitudinal direction thereof by a longitudinal seal device, and the webs of the first and second panel materials are heat sealed with the side gusset materials in a width direction thereof by a cross seal device.

Abstract: A spout is mounted on a plastic film being longitudinally and intermittently fed. The plastic film is punched by a punch blade to form an aperture. A carriage is moved for a distance corresponding to a space between the punch blade and a seal head and between a punch receiver and a seal receiver. The spout is inserted into the aperture. The spout and the plastic film are heat sealed with each other by the seal head.

Abstract: In a plastic bag including a triangular flap which has a folded hypotenuse and an open hypotenuse, a flow path is formed by the folded hypotenuse or the open hypotenuse to discharge air or gas through the flow path.

Abstract: A plastic bag includes a sealed region. The sealed region is formed along part or whole of an edge of the plastic bag by a section in which at least two plastic films are sealed to each other. The edge of the plastic bag includes a sealed edge of the sealed region. A method for making the plastic bag includes heat-sealing the films to each other to form the sealed region. The method further includes cutting the films such that part or whole of the sealed edge is formed by a cut edge. The method further includes heating an area formed by the cut edge of the sealed edge to smooth the area.

Abstract: A plastic bag has a safety even when a flap is not adhered on an outer surface of a side gusset. One of the opposite end portions of the side gusset is obliquely folded in half along a fold line and interposed between the two layers of the side gusset, so that the flap is formed by the end portion between the two layers of the side gusset. The flap includes a folded edge formed by a folded inner edge of the side gusset, and an open edge formed by one of the opposite end edges of the side gusset. The flap further includes a joining edge extending straight or curved and joining the folded edge and the open edge on opposite sides of the fold line.

Abstract: In a plastic bag including a triangular flap which has a folded hypotenuse and an open hypotenuse, a flow path is formed by the folded hypotenuse or the open hypotenuse to discharge air or gas through the flow path.

Abstract: An apparatus successively makes plastic bags each of which includes an end surface provided with a protrusion, without specially supplying a web of bottom gusset material. A first web of panel material is folded along a first folded line at a position adjacent to a side edge of the first web, while a second web of panel material is folded along a second folded line at a position adjacent to a corresponding side edge of the second web. A first folded portion is formed in the first web. There exists a distance between the side edge and the first folded line, which is larger than twice a distance between the corresponding side edge and the second folded line by a predetermined distance, after being folded. The end surface is formed by the first folded portion, the protrusion being formed by the predetermined distance.

Abstract: An apparatus to successively make plastic bags, each of which includes an end surface provided with a spout, by employing the general feeding way of panel material, to be simple in structure, low in cost, high in speed, and to make it possible to successively make the plastic bags two by two. A folded portion is formed in a first web of panel material, an aperture is formed in a web of end surface material, a spout is inserted into the aperture, the spout and the web of end surface material being heat sealed with each other. The web of end surface material and the folded portion are heat sealed with each other while the web of end surface material and a second web of panel material are heat sealed with each other about the spout.

Abstract: According to an apparatus for successively making the plastic bags, wherein the wastes 14 are formed in at least two areas adjacent to each other widthwise of the plastic film 1, and the apparatus can determine whether all of wastes 14 of each of the areas are discharged. The apparatus comprises at least one partition plate 20 in a suction path 16. The suction path 16 is divided into at least two widthwise of the plastic film 1. The wastes 14 is guided to each of the divided paths 21A, 21B, 21C, 21D and is discharged. The wastes 14 is detected by an optical sensor when the wastes 14 is discharged to each of the divided paths.